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Found 407 results

  1. Hi friend, please help me, i want to calculate the COG (center of gravity) every component, and total COG of the model with summary feature (radioss environtment). But, when i used M-ADV1 (distribute mass) and choose the visualization node. but the COG is affected by the placement of visualization node? even though it used distribute mass (M-ADV 1)? is there a way to model the admass that not affected by the placement of visualization node? so we can get "more real" behaviour of distribute mass? I search in this forum, and found same topic, but there is no solution i think i'm sorry for my bad English Thank you before nb: i attached 2 simplify model (radioss 2017 environtment) all same but the placement of visualization node is not in same place. the COG in summary is totally different CENTER VISUALIZATION.hm SIDE VISUALIZATION.hm
  2. Hello everyone, I want to make a failure analysis using LaRC03 criteria. I would like to know if it is possible to use ESAComp and export data in a Radioss format. Regards, Antonin
  3. Hi I am trying to perform a (transient) thermal analysis where a composite plate is subjected to radiation. The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough and reflects it. How would I model this? Is it possible to do a thermal simulation like this with hyperworks software, like optistruct or radioss? I already looked at the tutorials but they don't match my case. I also tried acusolve but here it is not possible either because radiation through glass cannot be simulated properly.
  4. Hi, I would like to perform constituent material property calibration (tow and matrix) in Hyperstudy by coupling Multiscale Designer and Radioss models, similar to: https://www.altair.com/resource/using-radioss-hyperstudy-and-multimech-for-improved-composite-design https://www.altair-gmbh.de/resource/using-hyperstudy-and-multimech-for-advanced-composite-material-design I need to write the solver script that would generate a multiscale material model at each iteration.The Multiscale Designer graphical user interface does not show the commands that are used in the back end programs. Edit: The command lines can be found in the MDS user manual. There is a command for Homogenized Linear Material Export, but the command for multiscale material export is missing. Is this command not available or just missing in the manual?
  5. Hi all, I've been tasked with a problem and need to get my head around LaGrange-Eulerian contact. Overview. I have a plate structure positioned over an explosive. The Structure is mesh size 10mm. The explosive, air and ground are eulerian elements 25mm size. Problem When the explosive strikes the structure, one of two things occur. Either the volume fraction of explosive penetrates the plate and the plate deforms (I find this occurs with Stfval = 38500, gap = 38) or the volume fraction of explosive does not penetrate the plate but the plate remains largely undeformed with very small displacement (I find this occurs with Stfval > 100,000, gap = 38). Am assuming speed of sound to be 3000m/sec (best I could find for explosive). To my mind, the volume fraction should not penetrate the plate. Am a bit puzzled by the apparent lack of deflection in the structure when the explosive hits the structure. Output for the contact is giving me approximately the same force in all cases - although higher values of Stfval are giving higher forces (between 6.5-8e6N). There does seem to by much more contact energy in the lower Stfval runs. So I am tad confused. Any help would be much appreciated. Andy
  6. Hello, I need a help with procedure please.? I am able to create the adhesive brick elements mesh using optistruct (3D - connectors - area - "constant thickness" as Hexathickness - type "adhesives" ) in student version (Hypermesh 2019) (as in the image). But in Radioss ( Block format 140) (Hypermesh 2017.2), the same process is not working. While using the same procedure, I get the surface connector (as below) without thickness (even while creating through: 3D - connectors - area - "adhesive(contact)" as type). But I would like to create the brick elements. Also, I would like to do hexa positioning it with "mid thickness" option and I couldn't change the "shell gap" option to the "mid thickness" with the drop down (as shown in the highlighted below). Could anyone please tell me if it is possible and also how to create it in the Radioss.? Thanks in advance!
  7. Hi, I work sloshing in the basic rectangular tank with the SPH method. I will try to sloshing in a more complex structure in the future. I'm new to Radioss solver and SPH method. For this reason, there are a few things I would like to consult with you. It is clear that as the pitch size decreases, the number of particles formed increases. Increased number of particles will also increase accuracy and solution time. How is the ideal number of particles determined? I can read contact reaction force and pressure in the model I created. But as with the CFD, is it possible for me to read the fluid pressure? During sloshing, is the value I read from the pressure gauge on the test apparatus the same as the value I read on the contact surface? Thank you for your help
  8. Hello, I have a persistent error on some elements : ** ERROR ZERO OR NEGATIVE 2D SOLID VOLUME I work with QUAD in Axisymmetrical. Many additional errors were remove during debugging. A similar model (I believe) under an old version worked, however... etienne_AXY_cu_ag.hm
  9. Hi, I have an issue with cut approach (https://altairuniversity.com/learning-library/radioss-sub-modeling-cut-approach/). I'm modeling an half of full vehicle with the cut approach above. From this sub-model, with hyperstudy I modify a little bit the geometry and study how the crash changes dynamic. I wonder how dynamics could vary among runs if the section-force imposes original displacements? Many Thanks
  10. Hello, I am trying to perform a quasi-static simulation using radioss. The initial model entailing solely hyper-elastic materials is working fine. Now I replaced a material type 42 with material type 37 that is a bi-phase material. My problem is that when enabling a mass scaling through /DT/NODA/CST in order to reduce the kinetic energy of the model and perform a quasistatic analysis, the model doesn't follow the requested time step. And then the solver stops due to negative volumes. Is there a way perform a quasistatic FSI with radioss? If so which are the appropriate values for MAT37? Is it better to choose a different material? or it isn't possible to perform such an analysis and thus move it to acusolve. Here is my .hm file Quasistatic_indentation_fluid.hm
  11. I have done three point bend test using hypercrash to make model. I am using radioss solver. I am able to create model without any error. But there is no option to study result is coming in radioss solver window. Kindly help.
  12. Good morning, I have an issue when I run a RADIOSS .rad file on my local group's cluster. At the end of the analysis, It doesn't automatically extract the .h3d file, although It does so locally on my pc. I have all animations A0*, but I'd rather It extracts h3d automatically instead of doing manually with hvtrans. I use Radioss Block 120, Many Thanks
  13. Hi guys, i have a problem with my model when i ran the simulation. I would like to do the Danner crash test using radioss solver. But, when i ran my simulation, the time remaining indicator kept increasing. So, i would to know whether have i done wrong? Can someone please explain this situation to me? Please.
  14. Hello, for my Formula Student Team I am trying to simulate the deformation of the Anti Intrusion Plate. To replicate the real test I've tried to implement the Honeycomb Impact Attenuator Tutorial(https://altairuniversity.com/wp-content/uploads/2016/11/Crash_Box_1.pdf). I've attached the file. When I try to run the simulation the Energy Errror starts at 0% and then rockets up to 99.9%. Then the Simulation stops. ROOT: SteelDummy RESTART: 0001 NUMBER OF HMPP PROCESSES 4 02/12/2019 NC= 0 T= 0.0000E+00 DT= 2.1400E-04 ERR= 0.0% DM/M= 1.7748E-05 ANIMATION FILE: SteelDummyA001 WRITTEN NC= 100 T= 2.1400E-02 DT= 2.1400E-04 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 54.23 s REMAINING TIME= 126646.67 s NC= 200 T= 3.5753E-02 DT= 1.2229E-04 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 54.82 s REMAINING TIME= 76607.94 s NC= 300 T= 4.7072E-02 DT= 1.0479E-04 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 55.35 s REMAINING TIME= 58738.95 s NC= 400 T= 5.6878E-02 DT= 9.1867E-05 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 55.87 s REMAINING TIME= 49054.49 s MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 700 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 1940 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 3120 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 4080 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION NC= 500 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 56.40 s REMAINING TIME= 44815.82 s NC= 600 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 56.93 s REMAINING TIME= 45237.79 s NC= 700 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 57.43 s REMAINING TIME= 45635.91 s NC= 800 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 57.99 s REMAINING TIME= 46084.90 s NC= 900 T= 6.2841E-02 DT= 1.1099E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 58.58 s REMAINING TIME= 46552.16 s MESSAGE ID : 205 ** RUN KILLED : ENERGY ERROR LIMIT REACHED NC= 1000 T= 6.2841E-02 DT= 5.1022E-18 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 59.22 s REMAINING TIME= 47060.74 s ANIMATION FILE: SteelDummyA002 WRITTEN Thanks upfront, Konrad SteelDummy.hm
  15. HI All, I am running a crash analysis. I have no external force applied to my model except initial velocity and gravity. the model is set to impact on a rigidwall Will the External Forces Work remains constant or increase or decrease?? THANKS in Advance Regards, SUBHU
  16. Hi, In radioss manual, there is a contact energy formulation. This formulation considers normal force and tangential force? or only consider normal force? What is the 'L' and 'n'?? Thanks
  17. Hi, In RADIOSS theory manual, TYPE7 contact energy formulation is as follows. In formulation, what is the 'L' and 'n' ?? I think this contact energy formulation is only about normal contact force. Is there any formulation about tangential contact force? I want to know the reference about the formulation. Thanks.
  18. Hello. I'm carrying out roll over analysis on simple bus as shown in attached image. I've assigned imposed velocity along axis and not get rotation on tilt table. Ff you can help me in achieving a tilt please provide some steps to follow. simulation_15.avi
  19. Hi This figure shows the accelerations on the node using /TH/NODE and /TH/ACCEL. F_cut of /ACCEL is the recommended value (1650Hz). Filter CFC1000 (F_cut 1650Hz) is applied the acceleration using /TH/NODE. Why are they different? Thanks.
  20. Hi, I want to use /TH/MODE. I can't find it in HM. How can I find it?? Thanks.
  21. Hi, I'm using Hyperstudy 2017.2 and Radioss as a solver. I encounter an error when I perform the evaluate step in the DOE approach. It happens that during a run (whatever) the evaluate and extract steps can't finish succesfully, but there aren't errors in the messages box and in the .out file I can read that analysis is already finished with normal termination: in spite of this, the cursor keeps turning and seems to be waiting to finish evaluation. I realized that when it happens, there isn't the .h3d file in the run folder, even if run is completed and all animation A0# are created. I realized also that by finishing the "hvtrans" process from the task manager, or (is the same) Tclsh85t application, hyperstudy concludes the evaluate step, extracts results and goes to the next run. It's a random problem, but it always happens at least once. Thank you all for helping out.
  22. Hi, The problem is as follows. After 1 cycle, run file stops. Why doe it happens? How do I do? Thanks
  23. Hi, I have a question that comes from the user guide. (Radioss 2019 User's Guide p.239) 'To describe pretension with this method another two spring elements (/PROP/SPR_PRE and /PROP/ SPR_BEAM) need to be added.' I have an example. When the bolt joint with preloading (bolt joint stiffness 10000N/m, preload 10kN) is replaced by RBODY+SPRING element, 1) Distance between node1,2,3 is 10mm? 2) In PROP/SPR_BEAM, K1 is 20000N/m? (due to series spring??) 3) In PROP/SPR_PRE, Stif0 is 10000N/m? (same as bolt joint stiffness) Thanks
  24. Hello, I am simulating an impact of two bars falling to the floor. These bars are initially held together with a RBE2 element while falling down to the floor. I am now trying to delete this connecting RBE2 element right before the bars hit the floor. How do I do this? I am currently experimenting with sensors but I haven't been able to figure it out yet. Thank you Toon
  25. Hi,I am trying to simulate a bird impact on a plate with RADIOSS. So I am creating my model on hypermesh now, i chose to consider the bird as a fluid with a density of 438 kg/m3. I would like to work with SI units and the dimensions of the bird are : 0.1325m long cylinder with two hemisphere ends having a radius of 0.075m. I am now trying to mesh this geometry with the SPH module in hypermesh. So i entered a pitch of 1e-3m and a density of 438kg/m3 as i said before. But when i create the mesh, nothing happen and i only get this message "0 mass elements created". I attached my file with the topic. I don't know what could be my error, more of that I tried to do it using mm instead of m and it worked... But I really want to use SI units. Thank you in advance for your help, Gaspard. BirdStrikeSI.hm
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